log4js-node/docs/stderr.md

Standard Error Appender

This appender writes all log events to the standard error stream.

Configuration

• type - stderr
• layout - object (optional, defaults to colouredLayout) - see layouts

Example

log4js.configure({
  appenders: { err: { type: "stderr" } },
  categories: { default: { appenders: ["err"], level: "ERROR" } },
});